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Fluid-dynamic and NOX computation in swirl burners

机译：旋流燃烧器中的流体动力学和NOX计算

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摘要

Computational fluid dynamics simulations in a swirl combustor were coupled with chemical equilibrium calculations to evaluate the effects of swirl velocity and burner wall temperature on NO_X formation. The fluid-dynamic variables such as velocity, temperature, pressure and species concentrations were obtained by using the finite-element commercial software FIDAP. The chemical equilibrium system under consideration comprised 16 reactions and 20 species. The reaction set included reactions responsible for formation of NO_X and reactions believed to be responsible for soot formation in rich fuel-air mixtures. The Newton-Raphson method was used to solve the nonlinear system of equations describing the formation of equilibrium products in fuel-air mixtures. The main goal of this work was to develop a fast and robust computational approach to understand the impact of various design parameters on NO_X formation in gas-fired swirl burners. The results showed that increasing swirl monotonically reduced CO and unburned hydrocarbons. The reduction was as high as 5 orders of magnitude. The exit plane NO_X did not monotonically decrease with increasing swirl. NO_X values initially increased with increasing swirl and then decreased. The procedure outlined in this paper has potential for evaluating new burner designs and operating conditions quickly and robustly.
机译：将旋流燃烧器中的计算流体动力学模拟与化学平衡计算相结合，以评估旋流速度和燃烧器壁温对NO_X形成的影响。使用有限元商业软件FIDAP获得流体动力学变量，例如速度，温度，压力和物质浓度。正在考虑的化学平衡系统包括16个反应和20种物质。该反应组包括负责形成NO_X的反应和被认为负责在浓燃料-空气混合物中形成烟灰的反应。牛顿-拉夫森法用于求解描述燃料-空气混合物中平衡产物形成的非线性方程组。这项工作的主要目的是开发一种快速而强大的计算方法，以了解各种设计参数对燃气旋流燃烧器中NO_X形成的影响。结果表明，增加旋流单调减少了CO和未燃烧的碳氢化合物。减少高达5个数量级。出口平面NO_X不会随着涡旋的增加而单调减少。 NO_X值最初随着旋流的增加而增加，然后降低。本文概述的程序具有快速，稳健地评估新燃烧器设计和运行条件的潜力。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第24期|p.5030-5038|共9页
  • 作者

    K. Khanafer; S.M. Aithal;

  • 作者单位

    Vascular Mechanics Lab, Biomedical Engineering Department and Section of Vascular Surgery, University of Michigan, Ann Arbor, Ml 48109, USA Corresponding author;

    Mathematics and Computer Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, 1L 60439, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Numerical; Equilibrium; Swirl burners; NO_X; Emissions; Newton-Raphson;

    机译：数值;平衡;旋流燃烧器;NO_X;排放量;Newton-Raphson;

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